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java.lang.NullPointerException at com.nag.library.database.BooksDAO.getAllBooks(BooksDAO.java:24) at com.nag.library.service.BookService.getAllBooks(BookService.java:24) at com.nag.library.resource.BookResource.getBooks(BookResource.java:35) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at java.lang.Thread.run(Unknown Source)